Process for the manufacture of artificial threads, ribbons, films, or plates, from viscose



PAT

ENT OFFICE.

MAX MITIILER, OF FINKENWALDE, 'NEAR STETTIN', GERMANY.

rnocnss non THE murncrunn or ARTIFICIAL 'rnnnans, mesons, FILMS, on PLATES, rnom VISGOSE.

Ho Drawing.

To all whom it may concern:

Be it known that I MAX MI'ILLER, a citizen of the Free State of iPrussia, in the German Republic, residing at Finkenwalde, near Stettin in the Free State of Prussia, Germany, have invented Improvements in and Relating to a Process for the Manufacture of Artificial Threads, Ribbons, Films, or

' Plates from Viscose, for which application was filed in Germany Sept. 6, 1918; and I do hereby declare the following to be a full,

. from an economic point of view, the recovery of hydro cellulose structures was essential.

It has now been found that especially valuable products may be obtained in the manufacture of the so-called staple-fiber and other viscose structures if the waste lye of the sulfite cellulose production is used in the precipitating bath. Y

The presence of hexosene and pentosene or of tanning and non-tanning substances in result. The dark color of the waste sulfite lye does not affect the process but aclearthis sulfite lye and the behavior of the waste lye with regard to mineral acids and salts have evidently contributed to this surprising ing-up sufficient for spinning purposes may be obtained.

It has also been found. that the waste sulfite lye may with equal advantage be used as first element of the acid bath if other viscose products not produced by spinning are to. be precipitated and fixed from the viscose solutions.

In the manufacture of artificial threads" and staple-fibers preferably a waste lye is used which by suitable means such as .sul-' furic acid, oxalic acid or sodium carbonate has been freed of lime and is condensed by.

evaporation. This waste lye is varied toa favorable acid content with sulfurous acid, sulfuric acid or hydrochloric-acid, the

Specification of Letters Patent.

Application filed m 17, 1920: Serial No.- 397,144. I

amount of acid being regulated during spinning.

, Ifor example a spinning bath is used which 1s made by mixing together parts of extract of sulfite of 30 Be. 11 parts of sulfuric acid of 66% and 59 parts of water. Precipitated sulfate removed.

The use of the waste lye of sodium sulfite which has been produced either directly by boilmg of wood with thelye of sodium bisulfite or by convertingof sodium salts from the waste lye of'lime', has proven especially advantageous. The waste lye obtained by the manufacture of sulfite spirits is also very useful, in whlch case however a greater amount of the sulfite washes are to be employed. (For the example given above, to parts are necessary.)

Lastly, it been found that an addition of a hardening agent to the precipitating bath of the waste lye of sulfite has an advantagequs effect upon the quality of the product. In order to obtain special effects hardening agents, such as formaldehyde sulfate of alumina and the like, may be used and different additions to the precipitating bath, such as animal glue, sea-weed mucilages and so forth, may be made.

The water sensibility and the. coloring ability of the cellulose structures may in this wag be especially favorably efi'e'cted.

s has been mentioned above mineral acids and also acid salts are well known as precipitating bath for viscose. In practice, heretofore, the Muller-bath has been used mainly. In the industry this precipitating bath was made by dissolving 1n water the bisulfate obtained as a waste roduct and adding sulfuric acid until t e required of lime is of course' cult to obtain as a waste product at the present by waste sulfite lye whiehis substantially valueless. It was not to be expected that such a complicated waste lye with its dark color (nearly black) and with all its impurities could be used, for the manufacture of'artificial silk. It was, in-' stead, a new andunexpected result.

The action resulting from the substance dissolved in the waste sulfite lye is not yet quite explained. The glycose substances (hexosene and pentosene) protect the thread or film produced against a tooenergetical ac tion of the sulfuric acid while the acid sulfites of the lye slowly decompose, giving up sulfurous acid which besides the added mineral acid (sulfuric acid) effects precipitating and fixing of the fiber.

According to this invention, the bisulfite, which is now diflicult to obtain, and the neutral sulfate contained therein is replaced by the waste lye of sulfite; and further, a portion of the free sulfuric acid of the bisulfate is replaced by sulfurous acid.

I claim as my invention:

1. The herein-described process of manufacturing artificial threads and other structures from viscose which consists in squirting the viscose into a precipitating bath comprising acidified waste lye of sulfite cellulose.

2. The herein-described process of manufacturing artificial threads and other structures from viscose which consists in squirting the viscose into a precipitating bath comprising waste lye of sulfite cellulose to which an acid salt has been added.

3. The herein-described process of manufacturing artificial threads and other structures from viscose which consists in squirting the viscose into a precipitating bath comprising waste lye of sulfite cellulose to which a mineral acid has been added.

4. The herein-described process of manufacturing artificial threads and other structures from viscose which consists in squirting the viscose into a precipitating bath comprising waste lye of sulfite cellulose'to which sulfuric acid has been added.

5. The herein-described process of manufacturing artificial threads and other structures from viscose which consists in squirting the viscose into a precipitating bath comprising acidified waste lye of sodium sulfite.

6. The herein-described process of manufacturing artificial threads and other structures from viscose which consists in squirting the viscose into a precipitating bath comprising the waste lye obtained by the manufacture of sulfite spirits.

7. The herein-described process of manufacturing artificial threads and other structures from viscose which consists in squirting the viscose into a precipitating bath comprising waste lye of sulfite cellulose to which an acid and hardening agents have been added.

8. The herein-described process of manufacturing artificial threads and other structures from viscose which consists in squirting the viscose into a precipitating bath comprising waste lye of sulfite cellulose to which an acid and formaldehyde have been added.

9. The herein-described process of manufacturing artificial threads and other structures from viscose which consists in squirting the viscose into a precipitating bath comprising waste lye of sulfite cellulose to which an acid and hardening agents and other additions to obtain special effects have been added.

10. The herein-described process of manufacturing artificial threads and other structures from viscose which consists insquirting the viscose into a precipitating bath comprising waste lye of sulfite cellulose to which an acid and hardening agents and glue have been added.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DR. MAX MULLER.

Witnesses:

R-UDoLF BAUMGARD, RICHARD KI'TKEN. 

